Determines whether the raw bytes of the two values are equal.
This is particularly handy for arrays, since it allows things like just
i96s instead of forcing
[6 x i16].
Above some backend-decided threshold this will emit calls to
like slice equality does, instead of causing massive code size.
It’s UB to call this if any of the bytes in
*b are uninitialized.
Note that this is a stricter criterion than just the values being
T has padding, it’s UB to call this intrinsic.
(The implementation is allowed to branch on the results of comparisons,
which is UB if any of their inputs are